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This is happened to me a 1000 times and im ticked off.
When logging in or when I do some work on my SACE my (H:) at school keeps going down. None of my classmates have any problems neither does the school it seems its affecting me badly.

Error Message:
H: Not Accessible
Connection could not be resolved.

This happened already twice today actually the third time! My admin is scratching his head wondering what the hell is going on
And he said plug the ethernet cord in did that plus logged out logged back in and it does it in 5 seconds and I cannot access any files.
From XP78USER

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Dani AI

Generated

confirmed this happens while on Wi‑Fi and is right to suspect a network problem. The red “X” on a mapped H: usually means the client lost its TCP/SMB connection to the file server — the cause can be the wireless link, a local adapter/driver/power setting, a VPN/virtual adapter, or a server-side idle/disconnect policy. The following checklist isolates the cause and gives fixes you can hand to the admin.

Quick diagnostics to run when H: shows the red X (open an elevated Command Prompt):

ipconfig /all
ping -n 30 <server-name-or-ip>
net use

If ping to the server drops when H: disconnects, it’s a network drop (wireless or DHCP). If ping stays steady but net use shows the share as unavailable, credentials or SMB/session issues are likely.

Client-side steps to try

  • Test with wired Ethernet: if stable on wired but not on Wi‑Fi, focus on the wireless link.
  • Disable Wi‑Fi power saving: Device Manager → Network adapters → adapter properties → Power Management → uncheck “Allow the computer to turn off this device to save power.” In Power Options set Wireless Adapter to Maximum Performance.
  • Update or roll back the Wi‑Fi driver.
  • Disable virtual adapters or active VPNs temporarily (they can change routing).
  • Clear and re-add credentials in Control Panel → Credential Manager. Remap the drive using net use H: \\server\share /persistent:yes after deleting the old mapping (net use H: /delete).

Server/admin checks to request

  • Check for SMB idle-session timeouts, per-user session limits, or aggressive DHCP lease churn.
  • Look at server-side event logs for disconnected sessions and the school switch/AP logs for wireless drops.
  • Confirm no firewall/AV is blocking SMB for that client and that Group Policy mapping scripts run after the network is ready.

Collect ipconfig /all, a ping -n 100 capture, and net use output to show the admin. These items quickly distinguish “bad wireless link” vs “server/session policy” so the admin can target the fix.

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Member Avatar for rubberman

It sounds like your computer is having networking issues in connecting to the school's server (your H: drive). Are you using WiFi to connect, or wired ethernet?

Member Avatar for XP78USER

Wifi

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